Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48a7c17eefe3853…

MALICIOUS

PDF

70.0 KB Created: 2021-09-12 19:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0951fb08f681eec0bfcaf9de4233e541 SHA-1: 09472b1d5408d29da67f2a2542aa49d83ac20770 SHA-256: a48a7c17eefe38536512d329edf7f3ab9a04b4a668ab651d0f2c618539ca1388
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other potentially untrustworthy domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/97euaq1l2fic0vg0qhkd9egop3/90762340309.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bcd756b8---sefesojosazivivupipegoja.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/11495198529.pdfIn PDF document text
    • https://breedlife.com/upload/files/xumufiwen.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/60288158459.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/madutubetifozapadudaba.pdfIn PDF document text
    • http://master-br.ru/img/file/67537402600.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/zuwuleketexapisarovelof.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/479076640.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tevononadunufajuwev.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/70342118272.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/68850650481.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/jomegegivatuxurisofufajo.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/1656320346.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/60772330819.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351232d6874---xomudegunexu.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/36581385471.pdfIn PDF document text
    • https://mahae.hu/files/files/29835344213.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/somuwuzibuxigelazozev.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/57440592422.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/54318041067.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/ziduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=contact+transfer+iphone+to+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 10704 bytes
SHA-256: 7c275acaf9de6b48fb4cbd73adc36f892bf828b7d9c779e6539ac82fbaea1665
font_01_sfnt_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 15208 bytes
SHA-256: d4937d06c6ec8c9ff5b6fd550ca80a2c2d463d7c729306e8b9f9320aed679e21
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1